Betta Emergency - I have my Betta in a 2 gallon tank with 1 snail. It has a filter and a plant. My Betts started acting lethargic so I tested the amonia and the test said it was like an 8.0. I out amonia lock and did a 50 percent water change. The amonia has decreased to about 5.0. Is he a goner!?! What should I do!